We are also on the Serenade this Sunday and we have packed a sweater only. I don't usually get cold. I'm having "power surges" if ya know what I mean, so a sweater will be fine for about 2 minutes then I won't need it again for another 20 minutes.
We are really looking forward to this just as everyone else on the ship will be.
I think the site you were looking for was on a different board.